Grinding mill



L. J. cbsTA GRINDING MILL Dec. 29 1925' Filed Feb. 19, 1925 INVENTOR.

ATTORNEY.

Av I 2 6 m A 1 E mmm 6 1 J 1 j H M .o HAM amfi i M 2 4 0a Patented Dec.29, 1925.

UNITED PATENT OFFICE.

LOUIS J. COSTA, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO-STANDARDELEC- TRIC PRODUCTS, INC. OF PHILADELPHIA, PENNSYLVANIA, A. CORPORATIONOF DELAWARE.

GRINDING MILL.

Application filed February 19, 1925. Serial No. 10,199.

To aZZ whom it may concern:

Be it known that I, LOUIS J. COSTA, a citizen of the United States,residing in the city and county of Philadelphia, State of Pennsylvania,have invented certain new and useful Improvements in Grinding Mills, ofwhich the following is a specification.

My invention relates to mills of the type used in grinding material suchas coffee, and consists in the novel arrangement hereinafter describedand particularly pointed out in the appended claims.

An object of my invention is the provision of suitable mechanism forremoving ground material from the vicinity of a grinding member andallowing the same to pass out of the mill, and contemplates the use ofyielding, flexible, and preferably resilient brush-like members forperforming the above noted operation, brushes of this type affordingmaximum safety to an operator, or any person tampering with the machine.

A further object relates to the provision of a clutch-like devicebetween a driving and a driven part, the arrangement being such that thedriven part is positively locked to the driving part at the conclusionof a cycle during which said parts do not rotate together.

[A still further object deals with an arrangement for preventing endwisemovement of the rotatable grinding member.

For an illustration of one form which my invention may take reference isto be had to the accompanying drawing, in which:

Fig. 1 is a vertical sectional View of the mill showing the differentparts in the grinding position.

Fig. 2 is a sectional view on the line 22 of Fig. 1.

Fig. 3 is a View showing the brush supporting member and associatedparts of the clutch.

Fig. 4 is a perspective view of the brush.

Referring to Fig. 1, 1 represents a base or supporting member which isprovided with outwardly directed extensions 2 and 3. The extension 2 isprovided with a funnellike member 4 to aid in the reception of wholecoffee or other like material, while the extension 3 constitutes a portfor the dis charge of ground or shredded material.

A head 5 is attached to the supporting member 1 in any suitable manner,and these parts are provided with bearings 6 and 7 Rotatably mounted insaid bearings is a longitudinally extending shaft 8, said shaft beingrotated by any suitable mechanism such as motor 9. The shaft 8 also hasa worm loosely mounted thereon for feeding the coffee into engagementwith the grinding mechanism per se. A member 10 is in screw threadedarrangement with one hearing 7, said member 10 supporting the end thrustmember 11, all as shown in Fig. 1.

A fixed grinding disc 12 is mounted in the base 1, and associatedtherewith is a rotatable grinding disc 13. The last mentioned member isfixed to a supporting member 14, and together with the worm are looselymounted on the shaft 8. A collar 15 is rotatable with the shaft 8 andhas a circumferential groove 15" and longitudinally extending V-shapedopenings 15.

One face of the supporting member 14 is shaped to provideshoulders 14Attached to opposite sides respectively of said shoulders by screws orother fastenings means 14, are the outwardly movable spring detents 14.During the normal operation of the machine the enlarged ends of thespring detents are releasably locked in the openings 15, and the disc 13and supporting member 14 rotate together. it other times, the rotatabledisc 13 may encounter an abnormal resistance to turning action, such asoccurs when a pebble or nail enters the machine. hen this occurs, thespring action of the detents is insufficient to hold the enlarged endsin the openings 15 and, accordingly, the member 14 will no longer belocked to the collar 15. Thereupon, the movable grinding disc, thesupporting member 14 and the worm will assume a stationary position and,as the collar 15 continues to rotate, the enlarged ends of the detentswill travel in groove 15*. The outer wall of this groove during suchaction, presents end-wise movement of the rotatable grinding disc.

As soon as the pebble or nail leaves the machine, abnormal resistance toturning movement of the rotatable member is removed and the enlargedends of the spring detents drop into the openings 15". In this manner,the parts are positively locked together for continued operation withoutattention on the part of thev operator.

The brush supporting member 16 is per forated at 16 and is equipped witha yields, flex b b ush e ent 1.6., attend n preferablvparallel to the ofrotation of shaft 8. Supportingmembers 16 are fitted into the channels 19 and are held in place, by screw 17.

Brush ldmay comprise bristles or fine resilient Wires, a mass of felt,or equivalent yielding material.

Coffee, or like material, after descending through the funnel 4 will befed by the Worm in sueh manner as to enter between n e, e as y he r ndng i e 2 and 13 .The brushes 16 move with the rotatable grinding discand will, therefore,

at ur thane ,e ter-iorly of the grinding discs and cause any materialfound tlif ,v to escape by way of port 3.

As hasbeen noted, the brush element 16 is were and e dins yi ho l aoperator orany other person inadvertently insert into the port 3, aninjury will not result.

It is to be understood that although two brushes are shown in Fig. 1, a,smaller or greater number may be, used. It is likewise to be understoodthat the brushes could be mounted otherwise than on the movable grindingdisc, for instance, one or more, could placed on the. fined grindingdisc.

lVhat I claim, is:

1. In a. grinding'inilha casing, co-acting fixed and "rotatable grindingmembers in saidleasing. a brush supporting member movable with. saidrotatable grinding mom.- ber, said last mentioned member having .a'

channel. abi uslnhOlder in said channel, and

a flexible brush element secured to said brush-holder.

2.111 a grinding mill, driving and driven members, one of said mei'nbershaving a when m ra and. a ng m m e n saidother member, a portion of saidspring member enlarged and resting at, times in said. open and at othertimes engaging the surface of said one. of members.

3. In a grinding mill, a driving member, a member to be driven includinga grinding disc, said driving member havinga circumferentially extendinggroove and an opening transverse to said groove, and means on saiddriven member extending into the opening for looking said memberstogether, said means extending into the groove during another phase ofoperation and preventing end-Wise movement of said driven member.

4. In grinding mill, a driven member including a grinding dish, adriving member, means comprising a flexible spring releasablv lockingsaid members together, and means ooi'nprising said flexible spring preventing ondwise movement of said driven member. during a phase ofoperation when said locking means is inoperative.

5. In a grinding mill, a driving member, a member. to be drivenincluding a grinding disk, one of-said members having an opening. and anunrestrained flexible spring having an enlarged portion for clutchingengagement with said opening.

6. In grinding mill, a easing, co-act-ing fixed and rotatable grindingmembers in said casing, a brush supporting member movable with saidrotatable grinding member, parallel ribs on said supporting 'memberdisposed substantially at right angles to its axis of rotation, abruslrholder disposed between said ribs, and flexible brush elementsecured to said brush-holder.

7. In a grinding mill, co-acting fixed and rotatable grinding members, acasing enolosing said members and forming a channel for the reception ofground material, a discharge port comn'iunicating with said channel of alength permitting insertion of a hun'ian finger into said channel, and'iiexible brush structure rotatable with one of said grinding membersand yielding when in contact with and passing a finger inserted throughsaid port into said channel.

LOUIS J. oosrn.

